Electrical apparatus



L. WULFF.

ELECTRICAL APPARATUS. APPLICATION FILED OCT. I3, I920.

1,426,534) Patented Aug. 22, 1922..

- 2 SHEETSSHEET I.

T ig. I,

Fig.2.

Inventor:

Loui s Wu h F,

His Attorney L. WULFF.

ELECTRICAL APPARATUS.

Ai'PLICAJION FILED OCT. 13. 1930'.

Patented Aug. 22,- 1922.

2 SHEETS-SHEET 2.

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Fig.l4 55 35 37 lfiver-ntorw Hlll|lHIllIHIIIIHIIHIIIIHIIHIHIIHIIWI Louis Wulf'f',

- JO flh/IQM H i s Attorney UNITED STATES PATENT- OFFICE.

LOUIS wuLrr, on rrr'rsrrnrn, mnssscirusn'r'rs, Assrenon TOGENERAL ELECTRIC COMPANY, A CORPORATION or NEwYoRx.

nnno'rnrcar. APPARATUS.

. Q Specification Of Letters Patent. P t t Aug 22, 2

Application filed ctober 13, 1920. serial no. 416,668.

To all whom it may concern:

Be it known that I, LOUIS WULFF, a citizen of the United States, residing at Pitts- 'field, county of Berkshire, State of Massa chusetts, have invented certain new and useful Improvements in Electrical Apparatus,

of which the followingi's aispecification.

My invention relates to electrical apparatus and particularly to apparatus having and axial directions are relied upon for' "and have filling pieces inserted between theirends which take the radial thrust of windings supported about .the legs ofmag- 'netic cores, such as are employed in transformers, reactances and the like.

The object'of my, invention is to provide an improved means for retaining the Windings in a predetermined spaced relation and which is reliable, safe and readily manufactured. b

When assembling windings about the leg of a magnetic core, in the manufacture' of I 20 electrical apparatus, it is necessary that certain predetermined spaced relations shall be maintained both between the winding groups and between the windings and the core; hence to secure this end, spacing devices having elements placed in both radial maintaining the windings in the desired relations. p 9

These spacing elements usually project b'eyondthe edges of the windings themselves the windingsshould they tend to be disinsulating cylinders], as heretofore placed laterally; suoh filling piecesabutting against the walls of the insulating cylinders, particularly the inner ones, which are generally concentrically disposed about the.

of these spacing. elements and to make a solid abutment between the windings and pr ticed,'requires considerable skill and attention on the part of the mechanic assembling thepartsi By my invention, however, these spacing elements are readily "and quickly disposed in perfect. alignment and do not re uire the exercise of ahigh degree of skil on the part of the mechanic to-secure this end;

moreover asolid abutment is at the same time secured since I make use of an improved aligning and securing means inconuncti0n with the spacing elements. q

For amore complete understanding of the nature and objects of ,myinvention, refer- .interleaved disc coil windings 12.

ence should be had to the following detailed i description taken in connection with the accompanying drawlngs in which:

Fig. 1 shows an arrangement of windings further modification suitable for the arrangement of Fig. 1; while Figs. 8 to 14 show further details of this modification.

Referring now to Fig. 1 of the drawingsy lOdenotes' a magnetic core, of any suitable type, on the leg 11 of which are mounted These windings would be suitably connected as high and low voltage windings where the apparatus embodying my invention is a transformer, this being the type of electrical apparatus to which my invention will have its widest application.

The windings 12 are insulated from the core llby the inner insulating cylinder 13,

shown as interposed between. the core, 11

and the windings 12. .An outer lnsulating cylinder 14 is provided to insulate the windings shown on leg 11 from other windings,

or from exterior grounds such as the housing which may inclose theapparatus, or

from other portions of the core.

The windings, however, are themselves maintained in. a predetermined spaced relation, after they have been assembled, by the spacing elements shown at 16 in order that proper ventilation and insulation shall be atv all times provided.

-The spacing elementsfl6 may be any one of the forms hereinafter described, those specifically shown in Fig. 1 being U- shaped 'as more clearly shown in Figs. 2 and 3. In this form. the simple Us are slip ed over the winding coils and stacked one above the other. To "align the s acers 16 a channelshaped insulatlng mem of molded press-board or hardlfiber, is d1sposed along the 'backsof the. spacers 16 and has its straight upstandingedge members 18 engaging with the sides-of the. Us. To properly space'the backs of the Us from themher insulatingcylinder 13, the channel member 17 is provided with one or more insulating fillers 19 as shown.

It is readily seen that the use of a channel r 17, which may be I 30, while the top portions 38 of the side pormember,'as shown at 17, at once'provides the proper distancing ofthe coils with a solid abutment between them and the insulating cylinder 13, and atthe same time insures perfect'alignment of the spacing elements l6.

Instead, however, of a channel member with straight upstanding edge members as shown in Figs. 2 and 3, I may use a channel member of the type shown in Figs. 4 to 6. Here the channel member 20 has inturned edge members 21 which are adapted to engage with transverse recesses or grooves 22 out in the end portions of spacing elements 23. This arrangement provides an interlocking structure from which the spacing elements cannot be accidentally displaced. The

distance denoted a, by which the grooves 22 are disposed from the back ends of spacers, may be any that is desired, but is preferably such as to provide the desired depth of insulating abutment between the coils and the insulating cylinder against which the channel member 20 is disposed. The space between the spacing elements themselves in the channel member is filled by small rectangular fillers 24 which are cut snugly to fill the channel space, a sufficient number of them being inserted at each point exactly to equal the thickness of a coil such as shown at 12 inFig'. 6.

The use of an interlocking channel such as is shown at 20 is particularly advantageous where it is desired to dispense with the outer insulating cylinder, such as I have shown at 14, since such channel ties in the spacers and holds them against'lateral displacement in either a radial or tangential direction.

All the advantages,however, of a channel with inturned edges may be had from a' channel with straight upstanding edges by the use of the construction which I have shown in Figs. 7, 8, 9, etc.

In Fig. 7, I have shown a U-shaped channel member 30 with straight upstanding edges 31, which has its top and bottom portions 32 and 33 bent over to properly finish off the device.

shaped channel 30, I employ a slotted inperspective in Fig. 8. Y

The slotted filler 35 comprises two side portions 36 and a bottom or end portion 37. The filler shown in Fig. 8 is made two-ply or of two thicknesses of insulating material, but any desired thickness may be employed; the bottom portion 37 being bent under to fit in the bottom portion 33 of the channel tions 36 are likewise bent over to fit into the top portion 32 of the channel. diate parts 39 of the side portions 36 in Figs. 7 and 8 are shown as vertically disposed and To get the effect of an in-' turned edge in connection with the plain U- The. interme-' 1,42 e,eao

serve as a stay to engage with and hold the spacing elements 40 in place, which elements are also provided with transverse recesses or grooves 41 in their end portionsspaced a apart along the portions 39 of the split filler 35 small T-shaped fillers 44, preferably sufficient in number to have the depth of a coil- .43, are inserted in the spaces, indicated at 45 in'Fig. 8, which obtain between the protruding ends of elements 40. In this manner a solid back and abutment for the coils is provided which holds the elements 40 in perfect alignment against both radial and tan.- gential displacement.

The filling in the top portion- 32 of the channel is made solid by the use of a large T-element 46 which is shown in perspective in Fig. 13. The element 46 is shown as about to be inserted in place in Fig. '2' and a'ctually in place in Fig, 9 which is a top-plan. view of the device'shown in Fig. 7 with the portion32 cut away. It will be observed which are adapted to accommodate the passage of the cooling medium for the coils.

Should it be impractical or for other reasons undesirable to make the combined width of the filler 35, the breadth of ends 42 and the thickness of the channel 30 equal to the desired distance the windings or coils 43 must be spaced from the cylinder abutting the back of channel 30, then the coils 43 may be provided with additionalspacing fillers as shown at 55 in Fig. 14; Here a coil 43" is wound on a cylindrical filler 55so' that when assembled inplace it will snugly fit a ain'st the portions 39 and yet provide the desired distance or clearance between coils and insulating cylinder. C

Having now described what isat present the best means known to me for carrying out an embodiment of my invention, I would have it understood that such means are merely illustrative, and that I do not mean to be limited thereby to the exact details shown nor restricted in the choice'of recog nized equ valents except as defined 1n my claims hereunto appended.

What I claim as new and desire to secure 1 In an electrical apparatus, the co n bination withwindings composed of coils in assembledrelation, of spacing means for the windings comprising radially disposed" elements,- fillers and. a channel member, said channel member engaging said elements to secure them against lateral displacement .and to-hold them in alignment.

bination with: windings composed of coils in assembled relation, of spacing means for the channe fwindings comprising radially disposed elements, fillersand a channel member, said said elements to secure them against latera displacement and to. hold them inalignment and having-said fillers disposed therein to provide a solid abutment for said c0i1s. c i f l 3. A, Spacin device for disc-coil electrical windings, sai device comprising elements disposed among .the' windings, a member securin alignment andfillers dlsposed within the radiall channel member to provide a solid;backing.

4. A spacing device for-disc-coil electrical v windings, said device comprising elements radially disposed among the windings, .a

channel member securing saidelements in .u

alignment and fillers disposed within the channel member to provide asolid backing", said channel member being gage said fillers and rad ia elements to secure them against lateral, displacement; 2. In an electrical apparatus, the co1n-- 5. A spacing device for disc-coil electrical windings; said device comprising-elements radiall disposed among the windings, 'a .channe member for securing said elements in alignment and fillers disposed to provide a solid backing in said channel, said channel member having securing members disposed longitudinally of its upstanding edges, and

each of said radial elements being provided with transverse grooves near one end and sa dsecuring members extendlng into the grooves of said .radial element's to prevent isplaceme'ntthereof. a 'said elements in" In witness whereof, I have hereunto set myhand this 8th 'day of Och $1920.

formed to en-;

LOUIS? WULFF: Y 

